A vacation resort offers surfing lessons and parasailing. If a person takes a surfing lesson and goes parasailing, they will pay a total of $175. On Friday, 16 people went parasailing and 20 people took surfing lessons. The resort collected a total of $3101 for activities. How much does each activity cost?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.